package org.example;

/**
 * @ClassName Demo4
 * @Description
 * @Author zhangsw
 * @Date 2020/11/6 15:57
 * @Version 1.0
 */
public class Demo4 {
    public static void main(String[] args) {

    }


}

abstract class Fu {
    private void aa() {

    }

    abstract void bb();
}
